Add /downloads/latest/prerelease redirect (#2823)

Author: hugovk

downloads/managers.py

@@ -35,6 +35,9 @@ def latest_python3(self, minor_version: int | None = None):
         pattern = rf"^Python 3\.{minor_version}\."
         return self.python3().filter(name__regex=pattern).order_by("-release_date")
 
+    def latest_prerelease(self):
+        return self.python3().filter(pre_release=True).order_by("-release_date")
+
     def latest_pymanager(self):
         return self.pymanager().filter(is_latest=True)
 
@@ -52,5 +55,8 @@ def latest_python2(self):
     def latest_python3(self, minor_version: int | None = None):
         return self.get_queryset().latest_python3(minor_version).first()
 
+    def latest_prerelease(self):
+        return self.get_queryset().latest_prerelease().first()
+
     def latest_pymanager(self):
         return self.get_queryset().latest_pymanager().first()

downloads/models.py

@@ -298,6 +298,7 @@ def purge_fastly_download_pages(sender, instance, **kwargs):
             match = re.match(r'^3\.(\d+)', version)
             if match:
                 purge_url(f'/downloads/latest/python3.{match.group(1)}/')
+        purge_url('/downloads/latest/prerelease/')
         purge_url('/downloads/latest/pymanager/')
         purge_url('/downloads/macos/')
         purge_url('/downloads/source/')

downloads/tests/test_models.py

@@ -74,6 +74,28 @@ def test_latest_python3(self):
         latest_3_99 = Release.objects.latest_python3(minor_version=99)
         self.assertIsNone(latest_3_99)
 
+    def test_latest_prerelease(self):
+        latest_prerelease = Release.objects.latest_prerelease()
+        self.assertEqual(latest_prerelease, self.pre_release)
+
+        # Create a newer prerelease with a future date
+        newer_prerelease = Release.objects.create(
+            version=Release.PYTHON3,
+            name="Python 3.9.99",
+            is_published=True,
+            pre_release=True,
+            release_date=self.pre_release.release_date + dt.timedelta(days=1),
+        )
+        latest_prerelease = Release.objects.latest_prerelease()
+        self.assertEqual(latest_prerelease, newer_prerelease)
+        self.assertNotEqual(latest_prerelease, self.pre_release)
+
+    def test_latest_prerelease_when_no_prerelease(self):
+        # Delete the prerelease
+        self.pre_release.delete()
+        latest_prerelease = Release.objects.latest_prerelease()
+        self.assertIsNone(latest_prerelease)
+
     def test_get_version(self):
         self.assertEqual(self.release_275.name, 'Python 2.7.5')
         self.assertEqual(self.release_275.get_version(), '2.7.5')

downloads/tests/test_views.py

@@ -95,6 +95,18 @@ def test_latest_python3x_redirects(self):
         response = self.client.get(url)
         self.assertRedirects(response, reverse("download:download"))
 
+    def test_latest_prerelease_redirect(self):
+        url = reverse("download:download_latest_prerelease")
+        response = self.client.get(url)
+        self.assertRedirects(response, self.pre_release.get_absolute_url())
+
+    def test_latest_prerelease_redirect_when_no_prerelease(self):
+        # Delete the prerelease to test fallback
+        self.pre_release.delete()
+        url = reverse("download:download_latest_prerelease")
+        response = self.client.get(url)
+        self.assertRedirects(response, reverse("download:download"))
+
     def test_redirect_page_object_to_release_detail_page(self):
         self.release_275.release_page = None
         self.release_275.save()

downloads/urls.py

@@ -6,6 +6,7 @@
     re_path(r'latest/python2/?$', views.DownloadLatestPython2.as_view(), name='download_latest_python2'),
     re_path(r'latest/python3/?$', views.DownloadLatestPython3.as_view(), name='download_latest_python3'),
     re_path(r'latest/python3\.(?P<minor>\d+)/?$', views.DownloadLatestPython3.as_view(), name='download_latest_python3x'),
+    re_path(r'latest/prerelease/?$', views.DownloadLatestPrerelease.as_view(), name='download_latest_prerelease'),
     re_path(r'latest/pymanager/?$', views.DownloadLatestPyManager.as_view(), name='download_latest_pymanager'),
     re_path(r'latest/?$', views.DownloadLatestPython3.as_view(), name='download_latest_python3'),
     path('operating-systems/', views.DownloadFullOSList.as_view(), name='download_full_os_list'),

downloads/views.py

@@ -47,6 +47,23 @@ def get_redirect_url(self, **kwargs):
         return reverse("downloads:download")
 
 
+class DownloadLatestPrerelease(RedirectView):
+    """Redirect to latest Python 3 prerelease"""
+
+    permanent = False
+
+    def get_redirect_url(self, **kwargs):
+        try:
+            latest_prerelease = Release.objects.latest_prerelease()
+        except Release.DoesNotExist:
+            latest_prerelease = None
+
+        if latest_prerelease:
+            return latest_prerelease.get_absolute_url()
+        else:
+            return reverse("downloads:download")
+
+
 class DownloadLatestPyManager(RedirectView):
     """ Redirect to latest Python install manager release """
     permanent = False